Pollster's Poll of Polls of Pennsylvania

Not horserace so much as spaghetti, really. Check out the chart here. In less than a thousand words, there's this version: "[T]he margins reported by the four pollsters are scattered from well below to well above the trend line, making their effect on the overall estimate less powerful than it would be if they all agreed on the level of support for each candidate." They are cautious about putting too much faith in that new ARG poll.